Final answer:
To lock a computer, you can use the shortcuts Windows key + L or Ctrl + Alt + Delete and then select 'Lock'. Options Alt + F4 and Ctrl + Shift + Esc do not lock the computer but close applications and open the Task Manager, respectively.
Step-by-step explanation:
Locking a Computer with Keyboard Shortcuts
Locking a computer is a basic security measure to ensure that unauthorized users cannot access your system when you step away. There are specific keyboard shortcuts that can be used to quickly lock a computer.
- Windows key + L: This is the most straightforward shortcut for locking a Windows PC. Simply press the Windows key (usually represented by a flag icon) and the letter L simultaneously, and the computer will lock.
- Ctrl + Alt + Delete: While this key combination is often associated with accessing the Task Manager or other security options, one of the options after pressing Ctrl + Alt + Delete is to lock the computer. You'll need to select 'Lock' from the menu that appears.
Option C, Alt + F4, is commonly used to close applications and does not lock the computer. Similarly, option D, Ctrl + Shift + Esc, opens the Task Manager and also does not lock the computer.